What's On Today

By KATHRYN SHATTUCK

Published: January 26, 2010

10 P.M. (HBO) 24/7 JIMMIE JOHNSON: RACE TO DAYTONA This sports reality franchise presents its first nonboxing edition as it tracks the fleet Mr. Johnson, the reigning four-time Nascar Sprint Cup Series champion -- and the Associated Press's 2009 Athlete of the Year -- as he and his No. 48 Hendrick Motorsports team prepare for the Super Bowl of car racing, the Daytona 500, on Feb. 14 in Daytona Beach, Fla.

4 P.M. (ABC); 7 P.M. (55) THE OPRAH WINFREY SHOW Denise Richards discusses her divorce from Charlie Sheen and his most recent arrest.

8 P.M. (NBC) THE BIGGEST LOSER The teams race for immunity at this week's weigh-in, where tension arises after the trainers Bob Harper and Jillian Michaels suspect that a player is trying to throw the game.

8 P.M. (CBS) NCIS Tony (Michael Weatherly) and Ziva (Cote de Pablo) learn that a hit man may be on their flight when they escort a star witness in a government case home from Paris. Dina Meyer plays Holly Snow, the ''D.C. Madam.'' In ''NCIS: Los Angeles,'' at 9, the team receives an alert that an agent needs assistance.

8:30 P.M. (ABC) BETTER OFF TED Ted (Jay Harrington) helps his motor-mouth brother, Billy (Eddie McClintock), get a job selling lab equipment for one of Veridian's biggest suppliers. Elsewhere, Veronica (Portia de Rossi) and Linda (Andrea Anders) discover that a girls' charity supported by the company is pocketing most of the money.

9 P.M. (History) HOW THE EARTH WAS MADE Death Valley is one of the hottest places on earth, but its walls hold evidence of the coldest era on the planet. In this episode scientists look at how the valley, along with much of Nevada in the Basin and Range geological province, is being pulled apart along a fault, placing its floor nearly 300 feet below sea level. ''Life After People,'' at 10, explores what would happen to the world's food supply if humans were to disappear.

9 P.M. (Fox) HUMAN TARGET Chance (Mark Valley, right) turns up as an uninvited guest at a Russian embassy when his search for a friend's killer lands him in the middle of the international weapons trade.

9 P.M. (BBC America) LAST RESTAURANT STANDING The teams must concoct dishes using seasonal local ingredients that complement their restaurant concepts.

9 P.M. (Science) SEEING BLACK HOLES Astronomers and physicists go in search of scary dark spots in the universe. In ''Sci Fi Science: Physics of the Impossible,'' at 10, Michio Kaku designs a suit that would give its wearer the powers of a superhero.

9 P.M. (Animal Planet) WILD RECON The adventurer Donald Schultz heads home to South Africa, where he must extract blood samples from a cheetah and two rhinos, as well as capture -- by hand -- a gaboon viper, which has the longest fangs of any venomous snake -- up to two inches.

10 P.M. (Bravo) THE MILLIONAIRE MATCHMAKER Patti Stranger tries to help Justin Shenkarow, who starred on the series ''Picket Fences'' as a child, find love as an adult. But his initial impression leaves a lot to be desired.

10 P.M. (MTV) TEEN MOM The season ends as the young parents, Maci, Ryan and Amber, prepare to celebrate their babies' first birthdays. Meanwhile Catelynn and Tyler struggle with letting go of their daughter.

10 P.M. (WE) LITTLE MISS PERFECT Five-year-old Brianna works with a pageant coach, while her daddy holds two jobs to pay for everything. Lexi, also 5, is coached by her mother and grandmother, pageant veterans, but has trouble focusing during rehearsals. And what's with that gap in her teeth?

10 P.M. (USA) WHITE COLLAR Peter (Tim DeKay) and Neal (Matt Bomer) decide to take down an estate judge who is committing mortgage fraud after they discover a link with the mysterious agent Fowler (Noah Emmerich). KATHRYN SHATTUCK